Re: Simplest delay
Per the manual; 0 to 2,500 msec, adjustable in time, feet, meters. It, or at least this feature, was designed as line delay, not so much as an effect delay, which is the main reason I keep a couple around. I've always wondered what this device was based on, knowing its manufacturer's past reputation.
Added: Rereading the question, I'm not sure what it's smallest increment of adjustment is as I've only used them for impromptu delay stacks when I wasn't expecting to need. But with an adjustment by distance, I suspect you can get fairly accurate.